Snap switch



' June 2 1925. 39,819

C. AALBORG SNAP SWITCH Filed Aug. 30, L920 "llllll lllllll Illlllll,lllllll INVENTOR WITNESSES:

012mm Aalbory Patented June 2, 1925.

' movable UNITED STATES" "PATENT OFFICE-1.;

CHRISTIAN AALBORG, OF PITTSBURGH PENNSIL'YANIA, ASSIGNOB TO WESTING-HOUSE ELECTRIC & MANUFACTURING COMPANY A CORPORATION OF PENNSYL- VANIA.

SNAP swrrcn...

Application filed August 80, 1920. Serial No. 406,844.

To all whom it may concern:

Be it known that I,- CHRISTIAN AALBoRo, a citizen of the United States,and are'sident of Pittsburgh, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in Sna.Switches, of which the following is a specification.

My invention relates to electric snap switches, and it has for itsobject'the provision of aswitch having means for positively impartingmovements to the blades without losing any of the desirable features ofthe ordinary snap action.

One form of mechanism for accomplish: ing this result is shown in theaccompanying drawing wherein Fig. l is a plan view of the switch inclosed position. I

Fig. 2 is a side elevation showing, in full lines, the parts in closedposition, and, in dotted lines, the position occupied by the arts whenthe switch is en.

Fig. 3 is an elevation taken at rig t angles to the view of Fig. 2, and

Figs. 4, 5 and 6 arewiews similar to those of Figs. 1, 2 and 3, showingthe application of the invention to a switch otthe oscillating type.

As shown in Fig. 1, the construction in- 1 eludes theusual switch blades4, pivoted at 5, and having frictional engagement with contacts 6. Theouter ends of the blades carry the cross bar 7 which is made of anon-conducting. material.

A link 8 (Big. 2) is pivoted to the cross bar 7, at the point 9, while,at point 10, this link has a pivotal connection with the lever 11. Atits lower end, the lever 11 is pivoted, at 12, to the frame 13 and isprovided, at its upper end, with a bent-over portion 14 and, at itslower end, with spaced lugs 14a and 14b.

Pivoted to the frame 13. at 15, is the handle 16 which carries, at itslower end, an outstanding lug 17 supporting one end of the spring 18 andso positioned as to abut against one of the lugsna; and 146 when thehandle is'moved to on or to off position. .The other end of the spring18 is connected to the pivot 10.

By reference to Fig. 2, it will be seen that the spring 18, by reason ofits connection to the handle 16 and the pivot 10, serves to hold theblades 4 in either open or closed positiondepending n on whether thebandle is in its on or its 0 position.

Starting with the switch in closed position, the handle 16, when movedto the left,

brings its lugs 17 to bear against the lug 14a, thus im arting positivemovementfto the blades 4 or a distance suflicient tomove them out offrictional engagement with the I contacts 6. During this movement of thehandle 16, the sprin increased tension, an th 1 pivot 10 is moved to theright so 18 is placed under ciently the angle o'fflpull on 2 to causethe blades to be thrown to the pt tion indicated in dotted lines. Whenit is desired to close the switch, a movement of the handle in theopposite direction ca uses a reversal of the action justdesoribed;

In 'Figs. 4,5 and 6 is shown a switch of the oscillating type. In thisconstruction, blades 19, connected by a cross head 20, oscillate aboutpivots 21 carried in rojecting lips 22 of a frame 23, and, at t eiropposite ends, frictionally engage contacts 24 and 25, respectively.

Riveted to the cross head 20 is an arm 26 having pivotal connection toone end ofa link 27 which, at its other end, is pivotally connected to alever 28 and to one end of a coil spring 29. The other end of'the coilspring is secured to an outstandin lug 30 on a handle 31 pivoted at 32to the ame 23.

When the handle 31 is moved to its on or to its 01f position, the lug-30 abuts against shoulders 33 or 34' respectively, carried on the lowerend'of the lever 28,- causing such lever to rock on its pivot 35.

The 0 eration of the mechanism just described 1s substantially the sameas the device of Figs. 1 to 3, except that, due to the blades beingpivoted intermediate their ends,

the addition of the link member 27 is necessary in order to impartoscillatory movement to the blades 19 as the handle is moved back andforth.

My invention is not limited to'the specific structure illustrated, as itmay be variously modified without departing from the s irit and scope ofthe invention, as set fort in the appended claims.

I clalm as my invention: I i 1. In an electric switch, the combinationwith a base, a stationary contact member, and a movable contact memberpivotally supported from the base, of an outwardly oxtending arm carriedby the movable contact member, a handle'pivotally supported at a pointremote from the base and provided with an arm extending inwardly pastthe mentioned arm, a resilient connection fletween the remote ends bfthe respective arms, and a pair of spaced stop slioulders connected tothe movable contact member and engaged and actuated by the'handle forimparting positive movement to the movable contact member in eitherdirection during a portion of its movement.

2. In an electric switch, the combination with a base, an operatinglever and'a bridging member pivotally supported by the base, of linkmechanism pivotally connected to the bridging member and extending to apoint intermediate the ends of the operating lever, and a yieldingconnection between the link mechanism and the operating'lev'er, thecon-- neetion of the yieldingelement to the link mechanism being at apoint remote from the base andthe connection of the said element to theoperating lever being at a point adja cent to the base.

- 3. In an electric switch, the combination with a pivotally supportedoperating handle supported bridging member,

a proand actuated by the projection on the handle for imparting positivemovement to the bridging member after a predetermined movement of thehandle, the engagement of the ielding element with the projection of thebridging membcibeing at a point adjacent the point of pivotal supportfor the handle and its engagement with the operating handle being atapoint remote from the said pivotal support,

In testimony whereof, I have hereunto subscril'ied. my name this 4th dayof August, i l

. CHRISTIAN AALBORG.

member and air of spaced shoulders connected to the bridging member

